[FEATURE] automatic logging in this.$emit calls

> 3. Log the data you’re attempting to emit, so we see what the source should have emitted (if the call to this.$emit fails, we may not get good logs to show that, so it’s helpful to know if the data you’re emitting is empty, or if the data is present but we failed to emit for another reason.

This ticket should address #3 in https://github.com/PipedreamHQ/pipedream/issues/3005.

Adding a `debug = true` param in `$emit` should resolve this.